Also convicted of conspiracy and forgery was Francis X. Morrissey, 66, a lawyer who worked for Marshall. Morrissey could face eight years in prison.

Marshall, a Broadway producer and former U.S. diplomat, was accused of coercing his mother to alter her will in the last years of her life to ensure he gained full control of her nearly $200-million estate.

Prosecutors said Astor -- who died in 2007 at age 105 and who suffered from Alzheimer's disease -- was unable to understand the ramifications of her decisions when she altered her will.

Reporting from New York - After nearly two weeks of deliberations, a jury today convicted Brooke Astor's son on charges of grand larceny and conspiracy in a scheme to force the philanthropist and New York socialite to change her will before she died.

Anthony Marshall, 85, showed no emotion as the verdict was read in a packed courtroom. Found guilty on 14 counts, he could spend the rest of his life in prison.

The defense countered that Astor suffered only moments of confusion and that she was lucid during her meetings with lawyers to discuss her will. In lengthy closing arguments, defense lawyers exhorted jurors to consider only Astor's demeanor during those brief meetings.

After the verdict, Marshall and his wife, Charlene -- whom prosecutors had portrayed as a money-grubbing daughter-in-law -- walked stone-faced from the courtroom.

"I love my husband!" Charlene Marshall cried out as the pair, he leaning on a cane and clutching his wife's hand, pushed through a crowd of reporters and photographers without further comment. They drove off in a black limousine.

Morrissey followed minutes later, declining to comment.

The jurors did not speak to reporters afterward. However, in recent days they had made clear they were struggling to decide on at least some charges. On Tuesday, the judge turned down a defense request for a mistrial after one juror reported feeling personally threatened during the deliberations.

After the verdict, the jurors were put into a van and driven away from the courthouse .